Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities
Net income	$ 17,809	$ 17,663
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	419	418
Stock-based compensation	1,552	1,813
(Accretion) Amortization of premium on available-for-sale investments	(761)	65
Inventory valuation adjustment	863	925
Deferred income taxes	(1,399)	(1,667)
Noncash lease expense	752	741
Changes in operating assets and liabilities:
Accounts receivable	84	231
Inventory	3,330	(1,112)
Prepaid expenses and other current assets	(423)	376
Other assets	(50)	13
Accounts payable	(348)	217
Accrued liabilities	771	(115)
Customer deposits	(97)	770
Lease liabilities	(1,017)	(175)
Other liabilities	235	(542)
Net cash provided by operating activities	21,720	19,621
Cash Flows From Investing Activities
Purchase of property and equipment	(311)	(511)
Acquisition of business and intangible assets	(1,700)
Purchase of debt securities	(47,939)	(33,923)
Proceeds from maturities of debt securities	31,767	15,875
Net cash used in investing activities	(18,183)	(18,559)
Cash Flows From Financing Activities
Payment of dividends	(9,137)	(9,031)
Net proceeds from exercise of stock options	45	210
Payment for shares withheld for tax withholdings on vesting of restricted stock units	(166)	(228)
Net cash used in financing activities	(9,258)	(9,049)
Net decrease in cash and cash equivalents	(5,721)	(7,987)
Cash and cash equivalents at beginning of period	19,392	27,379
Cash and cash equivalents at end of period	13,671	19,392
Supplemental Disclosure of Cash Flow Information
Cash paid for income taxes	3,410	3,345
Right-of-use assets obtained in exchange for operating lease liabilities	814	715
Supplemental Disclosure of Noncash Investing and Financing Information
Property and equipment purchased but not yet paid		58
Cash dividend declared but not yet paid	4,599	$ 4,551
Indemnification obligation for acquisition of business and intangible assets	$ 300